一个民族的活力随天气而变化。

Law is not a system of rules, but a system of principles.

It’s not given to human beings to have such talent that they can just know everything about everything all the time. But it is given to human beings who work hard at it — who look and sift the world for a mispriced bet — that they can occasionally find one.

译文：要发勇猛心。人们不肯改过，多半是因为因循守旧、不肯向前；我们要鼓舞振作起来，不要迟疑，不要等待。对于小的过恶，要如同肉中有芒刺一般，立刻剔除；对于大的过恶，要像毒蛇咬自己的手指一样，要快速斩断，没有丝毫的停滞，这就是《周易》中所说的风雷之所以有益处的原因。

化学是物质的科学，但我更愿意将其视为变化的科学。